I saw a reference to rubbing compound. I would try polishing compound first. The abrasive properties of common materials from least to most are wax, polishing compound, then rubbing compound. My point is that polishing compound will put less trauma on the finish if it will work. Rubbing compound may dull the finish.
If you use rubbing compound you want to use polishing compound afterward to get the shine back all the way, followed by wax. I have found a product called X20 to work well on minor scratches.
Also, the original post doesn't say, but if you can catch your fingernail on the scratch, that part will not go away using this method.